What is the effect of high pressure deformation on bimetal composite liner?
High pressure deformation mainly by hydrostatic extrusion can improve the strength and plasticity of bimetal composite liner alloy at the same time, and reduce the brittle plastic transition temperature. These performance improvements may even be retained in subsequent processes.
The research on the influence of high pressure deformation on the performance of Jiangsu bimetal liner is introduced. The research of various countries shows that the research situation and various mechanisms proposed by various countries to explore the reasons for high pressure deformation to improve the performance of bimetal liner materials are summarized. The mechanism of high pressure deformation on defect healing and the mechanism of dislocation pressure multilateralization proposed by Soviet scholars are first proposed.
For the manufacture of bimetallic composite liner systems with a diameter of less than 10 microns, the traditional method of drawing by mold is difficult. The electrolytic corrosion method, which was successfully researched in the 1950s and then widely used, is effective in this case. Now, tungsten and tungsten rhenium bimetallic liner alloy (grades BAP5 and BP20) microfilaments with a diameter of 5-10 μ m have been prepared in batches by the above method, and the filaments with a diameter of 3-5 μ m have been prepared under laboratory conditions. The possibility of obtaining molybdenum and molybdenum rhenium alloy fine wires for lining plate was determined. The following technical data are the characteristics of industrial bilateral equipment for obtaining microfilaments with a diameter of 5-15 μ m by electrolytic corrosion.
The purpose of improving the high temperature resistance of bimetal composite liner material is to meet the requirements of engine valves, turbine blades and rocket engine materials. A California researcher applied the coating method to retain the strength of the metal corresponding to half the melting point of the refractory metal. The metal used for lining plate is a series of electroformed refractory metals, including nickel, nickel drill and nickel manganese. The specific process is: adding particles with a diameter less than 1 μ M, such as thorium oxide or zirconia mixture, as coating materials.
The proposal of the task When developing a thermionic diverter that converts flame heating directly into electrical energy, various possible bimetallic composite liner materials were studied. The results show that nickel base superalloy and more Jiangsu bimetal liner iron base alloys can meet the requirements of corrosion resistance, but their strength is not enough. In this regard, dispersion strengthened nickel based alloys or iron based alloys are slightly better.